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Chemical liquid injection system

  • US 8,177,757 B2
  • Filed: 06/09/2005
  • Issued: 05/15/2012
  • Est. Priority Date: 11/26/2004
  • Status: Active Grant
First Claim
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1. A chemical liquid injection system comprising:

  • a chemical liquid injector including a piston driving mechanism of a structure for holding and sliding a piston flange of a normal syringe including an elongated cylinder member and a piston member slidably inserted into the cylinder member from an opening at a trailing end of the cylinder member, the piston member having a piston head mounted at a leading end of an elongated piston rod, the piston member having the piston flange formed on an outer circumference of a trailing end thereof;

    a rodless syringe including the elongated cylinder member and a piston member slidably inserted into the cylinder member from the opening at the trailing end of the cylinder member, the piston member not having the piston rod and having the piston flange directly formed at a trailing end of the piston head; and

    an elongated piston adapter connecting the piston flange of the rodless syringe to the piston driving mechanism of the chemical liquid injector,wherein the piston adapter includes;

    an elongated, hollow adapter rod having an adapter flange formed on an outer circumference of a trailing end and held by the piston driving mechanism;

    an elongated adapter shaft placed inside the adapter rod and rotatable about an axis having the same direction as that of the adapter rod;

    a rotatable manual operation member connected to a trailing end of the adapter shaft and exposed near the trailing end of the adapter rod;

    an elongated flange engagement member releaseably engaging with the piston flange of the rodless syringe;

    an engagement supporting mechanism pivotably supporting a trailing end of the flange engagement member about the axis direction at a position protruded outward from a leading end of the adapter shaft; and

    an engagement open/close mechanism connected to a leading end of the adapter rod and engaging with the flange engagement member near a leading end thereof.

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